body {
    font-family: Arial, sans-serif;
    font-size: 14px;
    line-height: 1.5;
    color: #333;
    margin: 0;
    padding: 0;
    background-color: #f5f5f5;
}

.xh-window {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #fff;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0, 0, 0, .2);
    z-index: 9999;
    max-width: 450px;
    width: 100%;
    box-sizing: border-box;
}

.xh-title {
    font-size: 24px;
    font-weight: bold;
    margin-bottom: 20px;
    text-align: center;
}

.xh-form-group {
    margin-bottom: 20px;
}

.xh-form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

.form-control {
    display: block;
    width: 100%;
    height: 40px;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
    outline: none;
    box-sizing: border-box;
    font-size: 16px;
}

.form-control:focus {
    border-color: #007bff;
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, .25);
}

.xh-btn {
    display: inline-block;
    margin-bottom: 0;
    font-weight: 400;
    text-align: center;
    vertical-align: middle;
    cursor: pointer;
    background-image: none;
    border: 1px solid transparent;
    white-space: nowrap;
    padding: 10px 20px;
    font-size: 16px;
    line-height: 1.5;
    border-radius: 4px;
    transition: all .2s ease-in-out;
    color: #fff;
    background-color: #007bff;
    border-color: #007bff;
}

.xh-btn:hover {
    color: #fff;
    background-color: #0069d9;
    border-color: #0062cc;
}

.xh-btn-primary {
    color: #fff;
    background-color: #007bff;
    border-color: #007bff;
}

.xh-btn-primary:hover {
    color: #fff;
    background-color: #0069d9;
    border-color: #0062cc;
}

.xh-btn-block {
    display: block;
    width: 100%;
}

.xh-btn-lg {
    padding: 10px 30px;
    font-size: 18px;
    line-height: 1.3333333;
    border-radius: 6px;
}

.xh-input-group {
    display: flex;
    align-items: center;
    position: relative;
    width: 100%;
}

.xh-input-group input {
    flex: 1;
    margin-right: 10px;
}

.xh-social {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.xh-social-item {
    display: inline-block;
    width: 50px;
    height: 50px;
    background-repeat: no-repeat;
    background-position: center center;
    background-size: contain;
    margin-right: 10px;
}

.xh-mobile {
    background-image: url('https://cdn4.iconfinder.com/data/icons/social-messaging-ui-color-shapes-2-free/128/social-whatsapp-square2-512.png');
}

.xh-qq {
    background-image: url('https://cdn3.iconfinder.com/data/icons/popular-services-brands-vol-2/512/qq-512.png');
}

.xh-weibo {
    background-image: url('https://cdn4.iconfinder.com/data/icons/social-messaging-ui-color-shapes-2-free/128/social-weibo-circle-512.png');
}

.xh-user-register {
    text-align: center;
    margin-top: 20px;
}

.xh-user-register a {
    color: #007bff;
    text-decoration: none;
}

.xh-user-register a:hover {
    text-decoration: underline;
}

.xh-close {
    position: absolute;
    top: 5px;
    right: 5px;
    width: 30px;
    height: 30px;
    background-image: url('https://cdn4.iconfinder.com/data/icons/ionicons/512/icon-ios7-close-empty-512.png');
    background-repeat: no-repeat;
    background-position: center center;
    background-size: contain;
    cursor: pointer;
}